Formation of submicrocrystalline structure in titanium and titanium alloys and their mechanical properties

Forge-Hardened TiZr Null-Matrix Alloy for Neutron Scattering under Extreme Conditions

“…Figure 4 shows SEM images and elemental concentration maps of a polished cross section of the f-TiZr alloy, which was cut from a forged cylinder that was 20 mm in diameter. The very fine metallographic textures shown in these images should be effective to increase the hardness and strength of the metal [14], which has been repeatedly confirmed by previous studies, including those of Ti-based alloy systems [15][16][17][18]. This is also shown in our measurements of micro-Vickers hardness of the f-TiZr alloy at Hv = 339, which is significantly higher than that of non-forged Ti60Zr40 or Ti70Zr30 alloy with Hv = 230~280 [19].…”

Effect of hydrogen on the structural and phase state and defect structure of titanium alloy

“…All most widely spread methods of the ultrafine-grained structure formation in metallic materials are based on Severe Plastic Deformation (SPD). The use of the SPD methods enables the sizes of the structural elements in the material to be decreased down to the nanolevel and, as a consequence, the strength characteristics to be increased by a factor of 1.5-2 [4][5][6][7]. At the same time, the rate of hydrogen absorption by metallic materials is known to be increased with decreasing grain sizes.…”

“…At the same time, the rate of hydrogen absorption by metallic materials is known to be increased with decreasing grain sizes. Therefore, the prospects for the application of the UFG polycrystals as structural materials will largely be determined by the effect of hydrogen on the structural and phase state [5][6][7][8]. While penetrating into material, hydrogen produces a wide range of defects, such as vacancy clusters, and reacts with the existing ones, forming the so-called "defect-hydrogen" systems.…”

Microstructure and Grain Characteristics of Ti Nb40 Biological Implant Alloy

“…Severe plastic deformation methods [5][6][7] promote the production of ultra-fine grained semi-finished billets (blocks) and products with significantly high mechanical properties in comparison to their coarse-grained analogues. Usually, the nanostructured phase , ultra-fine grain in metals and alloys is attained by combining two or more different intensive plastic deformation methods [5,[8][9][10].…”